FIELD: analytical methods. ^ SUBSTANCE: analytical signals of iodide and iodate ions are simultaneously recorded using direct differential-pulse voltammetry method with potential scanning from -0.15 to -1.55 V against 0.1-0.2 M sodium sulfite solution. Silver electrode or carbon-containing electrode both coated with mercury film, or silver amalgam are utilized as indicator electrode. When determination of iodate ions is not followed by appearance of iodide ion peak in registered voltammetry pattern, formic acid is complementarily added to solution being analyzed and cathodic voltammetry pattern is then registered under the same conditions. ^ EFFECT: simplified analytical procedure and reduced analysis time. ^ 2 dwg, 2 tbl, 4 ex
